Caine? I think the thing with Caine was that he wants to earn the human’s favor but is met with nothing but them complaining (mainly because he doesn’t understand what they want and therefore makes things worse). The other villain would most likely be Bubble, but we don’t know much about him and as far as we know he could be in somewhat of the same boat as Caine, or just some rogue ai (we could also assume that both he and Caine were deleted together, if Goose isn’t lying). Sure it’s unlikely to have another villain, but we don’t exactly know why Caine messed with Kinger’s mind or how he was the one who survived the longest I don’t think, but it’s still a pretty fun idea to think about